2157104655321 has 192 divisors, whose sum is σ = 3910464552960. Its totient is φ = 1032142003200.

The previous prime is 2157104655313. The next prime is 2157104655353. The reversal of 2157104655321 is 1235564017512.

It is not a de Polignac number, because 2157104655321 - 2³ = 2157104655313 is a prime.

It is a super-2 number, since 2×2157104655321² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2157104654321) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 730477581 + ... + 730480533.

It is an arithmetic number, because the mean of its divisors is an integer number (20367002880).

Almost surely, 2^{2157104655321} is an apocalyptic number.

2157104655321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2157104655321 is a deficient number, since it is larger than the sum of its proper divisors (1753359897639).

2157104655321 is a wasteful number, since it uses less digits than its factorization.

2157104655321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468 (or 3457 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 2157104655321 in words is "two trillion, one hundred fifty-seven billion, one hundred four million, six hundred fifty-five thousand, three hundred twenty-one".